For the most part, there are two types of bonking: hypoglycemia (in which your body runs out of fuel, or glucose) and hyponatremia (a loss of sodium in the blood). When you hear the word “bonking,” it’s typically the former, but both are terrible fates. Here’s how to distinguish between the two types and what to do about it.

Triathletes spend hours in the pool practicing perfect stroke technique, but on race day, following buoys and staying on course is equally important. Sighting is a skill that needs to be practiced and perfected before race day. Follow these tips for your next open-water swim.